1252542440 has 16 divisors (see below), whose sum is σ = 2818220580. Its totient is φ = 501016960.

The previous prime is 1252542427. The next prime is 1252542469. The reversal of 1252542440 is 442452521.

It can be written as a sum of positive squares in 2 ways, for example, as 1086493444 + 166048996 = 32962^2 + 12886^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15656741 + ... + 15656820.

Almost surely, 2^1252542440 is an apocalyptic number.

1252542440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1252542440 is an abundant number, since it is smaller than the sum of its proper divisors (1565678140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1252542440 is a wasteful number, since it uses less digits than its factorization.

1252542440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31313572 (or 31313568 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 29.

The square root of 1252542440 is about 35391.2763262361. The cubic root of 1252542440 is about 1077.9471865429.

Adding to 1252542440 its reverse (442452521), we get a palindrome (1694994961).

The spelling of 1252542440 in words is "one billion, two hundred fifty-two million, five hundred forty-two thousand, four hundred forty".